The initial threat is going to be supercells with some tornadoes and straight line winds in western South Dakota, and then a long lived straight line wind event over southern South Dakota. The greatest threat will be along and near the I-90 corridor between Rapid City and Sioux Falls.
UPDATE: The SPC has also upgraded the risk for some of the Great Lakes states to moderate.
The main risks here will include hail and damaging winds as well.
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